Automatic starting-rheostat.



is released by a no-voltage electromagnet the bodying my improvements.

the motor-armature circuit when the line,-

STATES OFFICE.

JOHN L. HALL, OF SCl-1ENE(J"ADY, NElV'YORK, ASSIGNOR TO lENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

. AUTOMATED STARTlNG-RHEOSTAT.

Specification of Letters Patent. Patented ll'u'ly 3, 1906,

Application filed August 15, 1902. Serial No. 119,696.

T (LU Iv/107M771 Z switch-arm 1 and carrying a stiff spring 12, Be it known that LJOHN L. HALL, a citizen whose free end 18 adapted to bear against the of theUnited States, residing at Schenectad v, back of the switch-arm. county of Schenectady, State of New ork, Mounted onthe base 13 is solenoid 14, have invented certain new and useful Imwhoseccore 15 is suitably connected with the provements in Automatic Startrng-Rheorocker to rock the same on its pivot. A

stats, of which the following is aspecificaswitch-lever 16, closing on a contact..17,is in tion.

A circuit with the solenoid across the mains 18. Thisinvent on relates to rheostats for start- The connection between the core 15 and the ing electric motors; and its oh ect 1s to so conrocker is preferably a toggle composed of a structthe rheosta-t that it will automatically link' 19, pivoted atone end to the arm 11 and actuate the switch-arm and cut out the reat the other end to a second link 20, whose sistafic'e when the line-switch is. closed and further end is hinged to the base at 21. The then automatically reset the parts which ac-. core '15 is connected by a link 22 with the link tuate the switcharm, so that when the latter 19, and the solenoid is supported on ahinge 2-3.

A spring 24 tends to move the toggle in opposition to the attraction of the solenoid.

device will be ready to operate when the linecurrent is restored, but .no' energy "will be con- The movement of the rocker is regulated by a sumed by the actuating parts except during dash-pot 25, whose plunger is connected with the short time they are moving the switchan'arm 26 on the'rocker. A finger 27 on this arm. arm carries a-pin, as shown, on which is an in- In carrying my invention into effect I prosulatin -bushing, which strikes the end of the vide an electromagnet for operating the parts switch-lever 16 just before the rockcrf stops which actuate the switch-arm and'a switch moving, and thus open-circuits the solenoid. in circuit therewith, which is automatically The switch-arm 1 has an extension 28, also opened at the end of the travel of the switch carrying a pin, as shown, on which is an insuarm and is closed by the return of the switchlating-bushing, which closes the switch-lever arm to the off? position upon its release by 16 when said switch-ar1n goes to the off posi the underload-magnet. 1 tion. 1

In the accompanying drawings, Figure 1 is The operation of the device is as follows: a front elevation of a startin -rheostat eml/Vhen the line-switch 10 is open, the parts ig. 2 is a diai stand as shown in Fig. 2, the switch-arm 1 begram of circuits, showing the application of ing on the first contact of the resistance, the the rheostat to a shunt-motor. i rocker tilted to the left, the toggle l'lcxed, and The rheostat switch-arm 1 is pivoted at 2 the switch-lever 16 closed on its contact 17. and makes contact with the contacts 3. It is i To start the motor,.it is merely necessary to normally held in the off position by a spring close the line-switch 10, thus energizing the 4.. Pivoted on the switch-arm is an arma field-c il 7, the re lease magnet 6' in series ture 5, adapted to coact with a no-voltageor F therewith, the armature 8 through the reunderload release-electromagnet 6 in series sistance-coils 9, and the solenoid 14, which with the field-coil 7 of the electric motor, lby attracting its core'l5'straightens out'the whose armature 8 is in series with the resisti toggleand causes the rocker-arm 11 to pnsli ance-coils 9, connected with the contacts 3. the switch-arm 1 along the contacts 3 until In order to automatically actuate the the armature 5 strikes the magnet 6, and the switch-arm and cut out the resistance from switch-arm is magnetically held in this full switch.10 is closed, there is pivoted at 2a allows the rocker to continue its movement rocker having an arm 11, lying behind the after-the switch-arm has reached its maxion.posit ion. (See Fig. 1.) The spring 12 ,muln trayel, and by means of the finger 27 the switch-lever 16 is opened and the circuit of v 3 the solenoid 11 i is hroiien;

once flexes the toggle, returning the rocker to 2, but the switch-- the line-switch is again closed. 1

desire to secure The, spring 24 at the position shown'in Fig.

ant 1 remains held by the magnet 65. I When the line-switch is opened or the current turns it to the oifposition', where the projection 28 strikes the switch-lever l6 and closes it.- The parts are then restored to tion shown in Fig. 2, ready to What ii claim as new, and 'ioyletters Patent of the United States, is-.

1. In an automatic starting tric motors, a resi stance arrangcd-iir'thearmature-circuit of the motor, aserles'ofron;

tact-surfaces connected therewith, a contact device movable 'oversaid surfaces to increase and decrease the resistance in the armaturecircuit, an electromagnetic controlling device arranged to move said contact deviceto' position'with the 'rcsistanceout of the armatine-circuit. i I 2. In an automatic starting devicefor elec trio motors, a resistance arrangedin' the armature-circuit of the motor, a series of con tact-surfaces connected therewith, a contact device movable over said surfaces to increase and decrease the resistance in thearmaturecircuit, a solenoid having a coreoperatively connected to said contact device and adapt-.

I ed, when the solenoid is energized, to-move.

' ing a pivoted switch-arm, of a pivoted rocker said contact device to cut the resistance out ofthe' armature-circu t, an inde cuit including. the coils of sand solenoid, means for, automatically interruptingsaid latter circuit when theresistance has beencut out of the armature-circuit, and an electromagnet' having its coils included .pe'rma-' nently in series with the field-circuit of the motor and arranged to hold said contact device in position with the resistance out of the s'ring for o crating armature-circuit.

3. A rheostat to resistances, a switch-arm cooperating with the contacts, a solenoid for operating the switch-arm in one direction automatically, a the arm in the other traction,- an means for automatically cutting out said solenoid whenthc arm has reached the limit of its travel in one direction. 4. The combination with the switch-arm travel.

fails, the switch-arm is releasedand its springi re= h po h operate when devicefor elec said latter. circuit when the re- )endcnt cirhaving contacts connected v 'r'ockerafter the arm has sto "ing a of a 'starting-rheostat, of solenoid for 'opcrating the same autdmatiiially, a spring strained in operating the arm, and means for automatically cutting out said solenoid when the arm has reached its position of maximum 5. Thecombination with a starting-rheoe stat'having a pivoted switch-arm, of a solenoid ioractuatin'g said switch-arm automatically when the'circuit is closed, and a magnet for holding said arm at its maximum I travel.

6. The combination with the switch-arm of a starting rheostat, of a solenoid for oper- "ating the same automatically, means for autoy matically cutting out said, solenoid when the arm has reached. its osition'of' maximum travel, means ior-holdmgthe arm insaidgosition, and a'spring to retract thearmw released.

7. T he combinationwithv a rheostat have inga mova ating the arm,

rockerwhen the main circuit is close le independently of sai arm'for actuand pivoted switch-arm, of a ivoted rocker; 8'5 a solenoid for operatindgsaid means independent oi the solenoid for reosition.

turning the arm to its original eostat new 8. The combination with 21-1 ing a pivoted switch-arm, of a pivoted rocker a solenoid for operatfor actuating said arm,

the main circuit"'1s ing said rocker when closed,a springstrained in operating the arm, and means for returning the rocker'to its original position independently of the switch.

arm when the solenoid is o en-circuited.

9. The combination wit a rheostat having a pivoted switch-arm, of a pivoted rocker for actuatin said arm, a toggle connected with said roc er, a solenoid for operating said toggle, and means for holding the arm in the position of maximum travel. a 4

10. The combination with a rheostat hava solenoid for operatmg saidv rocker, and a switch-lever in circu t with said solenoid and controlled 'by said 'for actuating said arm,

rocker. r

ed with a spring bearing against sa d a solenoid for'actu'at'ing the rocker, a

no ivoted switch-arrmoi a pivoted'rocker magnet forholding the erm'at its maximum switch-lever in circuit with the 'to be opened by the travel; and a solenoid and adapted '12. The combination wit i-voted switch-arm,of a pivoted rocker ed with a spring bearing against said asolenoid foractuating the rocker, a at its maximum circuit withthe opened by the provi arm, magnet for holding the arm travel, and a switch-lever in solenoid and adapted to be a rheostat havv rocker after the arm has stopped and to be solenoid-circuit is opened, and means for reclosed by'the switch-arm when the letter returning the switch-arm to the off position turns to the off position. when the main circu t is opened.

13; The combination with a rheostat hav- In Witness whereof I have hereunto set my 5 ing a pivoted SWlEGh-EIIII, of pigcFed rocker hand this 13th day of August, 1902.

or actuating s'ai arm, a so enoi or o erating said rockenwhen the main circiiit. .is Y JOHN HALL closed, means for holding the arm at its posi- 'Witnesses 'tion of maximum travel, means for returning BENJAMIN B. HULL.

1c the rocker to its normal position when the JOSEPH A; L. ENDRES. 

